Does playing gimp guarantee you an Oscar?

I missed the show this year, but I hear Colin Firth won for playing a guy with a speech impediment. Which got me thinking about the conventional wisdom that Oscar loves gimps. It scans as true, conjuring an Edward Hopper mashup of Rain Man & Forrest Gump hanging at the diner, but I've never paid it much attention.

UNTIL NOW.

Let's run it back to the 80's, roughly charting the era of corporate dominance in Hollywood.
And stick to Best Actor winners, since I'm lazy.

I'll just list the gimps to save screen acreage:

80's
Henry Fonda, old guy with Parkinsons.
Dustin Hoffman, the archetypal Rain Main.
Daniel Day Lewis, guy with cerebral palsy.

90's
Al Pacino, blind scenery-chewing guy.
Tom Hanks, guy with AIDS.
Tom Hanks, the archetypal Forrest Gump. Didn't realize those were back to back- yikes!
Geoffrey Rush, mentally ill pianist.

00's
Jamie Foxx, blind pianist
(and my God, what did Russell Crow get an Oscar for in Gladiator, looking stoic and manly?)

10's
Colin Firth, stuttering king


The Roaring 90's seem to have embarrassed Academy voters into self restraint, but King George has the 10's off to a blistering start.

We'll find out if Colin is a harbinger or an outlier of the new decade soon enough.